X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=mm%2FKconfig;h=3aa819d628c112cc185f9545c7ae5e3fb8a5c310;hb=108c1961847df2a875047c0fd27b419cb817d213;hp=0016ebd4dcbac755450579197d317738727816a8;hpb=d870ec7281d8429ab17d2e0324f4d8ca3f3de62d;p=linux-2.6

diff --git a/mm/Kconfig b/mm/Kconfig
index 0016ebd4dc..3aa819d628 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -143,6 +143,18 @@ config MEMORY_HOTREMOVE
 	depends on MEMORY_HOTPLUG && ARCH_ENABLE_MEMORY_HOTREMOVE
 	depends on MIGRATION
 
+#
+# If we have space for more page flags then we can enable additional
+# optimizations and functionality.
+#
+# Regular Sparsemem takes page flag bits for the sectionid if it does not
+# use a virtual memmap. Disable extended page flags for 32 bit platforms
+# that require the use of a sectionid in the page flags.
+#
+config PAGEFLAGS_EXTENDED
+	def_bool y
+	depends on 64BIT || SPARSEMEM_VMEMMAP || !NUMA || !SPARSEMEM
+
 # Heavily threaded applications may benefit from splitting the mm-wide
 # page_table_lock, so that faults on different parts of the user address
 # space can be handled with less contention: split it at this NR_CPUS.